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轉換比率:金額 X 10=金幣數(shù)量, 例100元=1000金幣 | 論文字數(shù):14397 | ![]() | |
折扣與優(yōu)惠:團購最低可5折優(yōu)惠 - 了解詳情 | 論文格式:Word格式(*.doc) | ![]() |
摘要:以Na2C2O4, K2C2O4·H2O和Nb2O5為原料用化學合成法制備了Na0.53K0.47NbO3(簡稱KNN)粉體,用原位合成工藝制備LiBiO3對KNN進行摻雜。通過熱壓燒結工藝制備了(1-x)KNN-xLBO(摩爾分數(shù)x為0.05、0.075、0.08)陶瓷。工藝條件為:燒結溫度1080℃,壓力10.2MPa,保溫6h。使用X射線衍射、掃描電子顯微鏡(SEM)對KNN-LBO透明陶瓷片樣品的結構、形貌進行了分析。用頻譜儀和d33測量儀測量了樣品的壓電性能。結果表明:隨LiBiO3含量增加,陶瓷樣品的介電常數(shù)r、壓電應變常數(shù)d33、機電耦合系數(shù)kp、kt、介電損耗、體積電阻率會有所降低。LBO摩爾百分數(shù)為7.5% 的KNN陶瓷的d33、kp、kt、體積電阻率分別為:80.5pC/N、0.169、0.0155、2.308×108,r與tanδ值相對較小。 關鍵詞:鈮酸鉀鈉陶瓷;無鉛壓電材料;熱壓燒結;壓電性能
Abstract:Using Na2C2O4, K2C2O4•H2O and Nb2O5 as raw materials, the Na0.53K0.47NbO3 (KNN) powder were prepared by chemical synthesis. The LiBiO3 was synthesized in situ as additives of KNN ceramics. The (1-x)KNN-xLBO (x = 0.05、0.075、0.08) were hot-press sintered under a pressure of 10.2 MPa at 1080 ℃ for 6 hours. The crystalline structure and micro-morphology of the ceramics were analyzed by an X-ray diffractometer, scanning electron microscopy (SEM). The piezoelectric parameters were measured by using an impedance analyzer and a d33 meter. The results showed that the piezoelectric constant d33, electromechanical coefficient kp、kt, dielectric permittivity r, dielectric loss tanδ and density of the ceramics were decreased as the LBO content increased. The d33, kp, kt and density of the KNN with 7.5% LBO were found to be 80.5 pC/N、0.169、0.0155、2.308×108 respectively, r and tanδ value is relatively small. Keywords: potassium sodium niobate ceramics; lead-free piezoelectric materials; hot-press sintering process; piezoelectric properties
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